I stumbled upon this when I searched for the unknown device. But I couldn't find a working solution... I tried for a while and found this solution:
1.) Download the Integration Services from Microsoft Download Center...
A filesystem does always cost a bit of performance.
But you can easily access the files and save backups and templates on this store.
Proxmox VE itself needs no fast disk. The main load is logging and this is not much data but they come...
Correct, the auto-loading of the CD drivers was detecting normally during install for the disk drivers. The SPICE driver is only needed if you use the SPICE access from proxmox GUI for a smoother console experience, for RDP/other remote access...
I ran into similar odd issues but can confirm no issues using the Virtio-win-0.1.215 version of the ISO
Only weird thing to note is even after running the installer on the ISO, I had to manually install the correct SPICE driver (if in use) from...